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Two Mechanisms Cause Dual Velocity Maxima in the Kuroshio East of Taiwan

机译：台湾黑潮东部引起双重速度最大值的两种机制

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摘要

We examine velocity structure and variability across the Kuroshio east of Luzon and Taiwan using two years of Seaglider observations. The Kuroshio exhibits a single velocity maximum south of Luzon Strait, strengthened downstream. It is occasionally accompanied by a second velocity maximum, and the two together form a dual-core structure east of Taiwan. Two possible mechanisms are responsible for the dual-core phenomenon. One is attributed to intrusion of the Kuroshio into the South China Sea through Luzon Strait, which occurs normally during persistent northeasterlies in winter. The streamline diffluence across the strait during the Kuroshio's westward intrusions and subsequent shaping of the boundary current through interaction with a quasi-permanent anticyclonic recirculation east of Taiwan favors the appearance of the offshore velocity maximum. The other possible mechanism is related to the dissipation of westward-propagating mesoscale anticyclonic eddies. As the impinging eddy deforms and is eventually dissipated along the Kuroshio's eastern flank, the northward flow contiguous to the western half of this eddy is enhanced, causing an offshore core downstream. Glider-observed theta-S properties in the dual cores indicate different water masses are mixing, consistent with two different mechanisms causing the dual cores.
机译：我们使用两年的Seaglider观测资料研究了吕宋以东和台湾东部黑潮的速度结构和变异性。黑潮在吕宋海峡以南表现出单一的最大速度，在下游得到加强。它偶尔会伴随着第二个速度最大值，并且两者共同形成台湾东部的双核结构。双核现象是由两种可能的机制引起的。一种是由于黑潮通过吕宋海峡入侵南中国海，通常发生在冬季持续的东北风期间。在黑潮向西侵入期间，海峡两岸的流线扩散以及随后通过与台湾以东的准永久性反气旋再循环的相互作用而形成的边界流形成，有利于海上速度最大值的出现。另一个可能的机制与向西传播的中尺度反气旋涡的消散有关。随着撞击的涡流变形并最终沿黑潮的东侧消散，与该涡流西半部相邻的北向流动增强，在下游形成了离岸核心。滑翔机观测到的双核中的theta-S特性表明不同的水团在混合，这与导致双核的两种不同机理一致。

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  • 来源
    《Oceanography》 |2015年第4期|64-73|共10页
  • 作者

    Yang Kai-Chieh; Wang Joe; Lee Craig M.; Ma Barry; Lien Ren-Chieh; Jan Sen; Yang Yiing Jang; Chang Ming-Huei;

  • 作者单位

    Natl Taiwan Univ, Inst Oceanog, Taipei 10764, Taiwan;

    Natl Taiwan Univ, Inst Oceanog, Taipei 10764, Taiwan;

    Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA;

    Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA;

    Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA;

    Natl Taiwan Univ, Inst Oceanog, Taipei 10764, Taiwan;

    Natl Taiwan Univ, Inst Oceanog, Taipei 10764, Taiwan;

    Natl Taiwan Univ, Inst Oceanog, Taipei 10764, Taiwan;

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